<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
	</body>
</html>
<script type="text/javascript">
	    for(var i=0,l=arr.length;i<l;i++){
	        var c=arr[i];
	        if(fn.call(c,i,c)===false){
	            return false;
	        }
	    }
	};
	function box1(index,num) {
	    console.log(index,num);
	}
	var arr=[10,9,8,7,6,5,4];
	forEach(arr,box1)
</script>
